Filter.



No. 817,252. PATENTED APR. 1o, 1906.

G. M. KNBUPER. FILTER.

APPLICATION FILED AUG. 12, 1904,

2 SHEETS-SHEET L No. 817,252. PATENTED APR. l0, 1906.

G. M. KNEUPER.

FILTER. APPLIoATIoN FILED AUG. 12. 1904.

2 SHEETS-SHEET 2.

` @woe/Mofa as...

j the pulp UNITED sTATEs PATENT oEEroE.

Specification of Letters Patent. Appuosaon nea August 12, 1904. serial No. 220,450.

Patented April 1o, 190e.

To all whom it may concern,.-

Be it known that I, GEORGE M. KNEUPER, a citizen of the United States, and a resident of the borou h of Manhattan, city, county, and State of ew York, have invented certain new land useful Improvements in Filters, of which the following is a specification. l

My invention relates to the manufacture of filters,vand has for its object to provide a very efficient and durable filter of considerable lightness.

The invention will be fully described hereinafter, and the features of novelty pointed out in the appended claim.

Reference is to be had to the accompanyingjdrawings, in which- Y 4igure 1 is a `sectional elevation of an apparatus for making filters according to my in vention, showing said apparatus at the initial stage of the operation. Fig. 2 is a similar view showing the ap aratus at the final stage of the operation. ig 3 is a sectional plan on line 3 3 of Fig. 1. Fig.A l is a longitudinal section of the form of filter made with the apparatus shown in Figs. 1, 2, and 3. Fig'. 5 is a sectional elevation of another form of fil ter-making apparatus constructed according to my invention. Fig. 6 is a `sectionalelevation of still another apparatus embodying my invention, and Fig. 7 is a sectional plan taken on line7 7 of Fig. 6.

ln making my improved filter l em loy a vessel having a perforated wall, so thatlliquid may pass therethrough, and adjacent to this perforated wall l locate an expansible body adapted to be forced .toward said wall. lf the vessel is Jlled with paper-pulp sus ended in water, and if then the ex ansible Fody is distended or blown u lquicl y, the water will be forced through t e perforated wall; but will remain compressed between the eX ansible body and the perforated wall and wi l form a continuous sheet or lining against said wall.

ln detail the apparatus and procedure may be as follows:

ln Figs. 1, 2, and 3. A indicates the operative inner wall of the apparatus, which may be cylindrical and may consist of gerforated sheet metal or of wire-netting. indicates a pouch of saidpouch being folded over the outer wail C, which, as shown, `ma consist of two connected wire screens o cylindrical shape. The outer wall C is secured to a bottom D,

suitable porous or pervious material, such as canton-flannel, the upper edge ef which may be solid or perforated and which a is preferably provided with legs D', ,so Vthat the entire rece tacle ma be conveniently set within a tank or the li e. Within the perforated wall A is arranged an expansible body F, for which l generall em loy a rubber bag. This bag exten s su stantially the entire length or height of the receptacle and is secured at its top to a cover Gr. This cover may be provided with a filling-openin closed by a plug G and is normally hel down a ainst a fiange A at the top of the innr wal A by means of a nut H, which screws upon a perforated tube I, extending through the cover G and within the receptay cle. The upper end' of the bag F is secured to said tube l. lThe lower end of the tube may be free within the receptacle, or, if preferred, the lower end of the tube may, as shown, be passed through the rubber bag and through the bottom B, being there secured by a nut l. A strengthening-flange C is preferably located at the upper end of the outer wall.

ln operation the apparatus above described is laced in the tank, which is either empty or lled with water. -lPulp suspended in water is poured into the central chamber il. Then air is blown into the tube l, so as to issue through the perforations thereof into the bag F. By the application of suitable pressure the ba is quickly expanded against the inner wall into substantially the form shown in Fig. 2. The water is quickly driven` out through the perforated walls A and C and the pervious pouch B; but the pulp is retained againstthe inner surface of the inner wall A and forms a continuous compressed lningthereon. The pressure will of course cause the pulp-lining to conform closely to the meshes of the wall A, and the said wall and its pulp lining will therefore be securely connected, so as to render them available for use as one structure. However, the lining may be se arated from the wall A and used alone, if esired. After forming the lining on the inner wall, as described, the receptacle is removed from the tank.

The compressed-pulp lining K, produced IOO on the perforated wall A, constitutes an efficient filter either alone or to ether with said wall as a carrying-frame. T is filter, Fig. 4, may be removed from the apparatus by un screwing nut H, lifting off the cover G, taking hold of the ange A at the top of the inner wall, and lifting the inner wall, together with ceptacle and alter-lining is formed thereon in f .inner surface ofthe lining and out through the meshes of the perforatedwall. Another inner Wall of like construction is then put inthe rethe same nianner as above described,and thus the apparatus may be used for producing a great number of filters. It Will of course be understood that after the receptacle has been removed from the tank and before the inner Wall is removed the rubber bag should be deflated. The pouch B is not absolutely necessary, but prevents the iibers 'from assing to and through the outer Wall C Een the perforations of the inner Wall are beyond a certain size. The pouch B thus insures an easy separation of the inner Wall A from the other parts of the apparatus after the pulp lining K has been made. If the meshes of the inner Wall are suiiciently close, the pouch B, and even the outer Wall C, may be dispensed with. In any event, however, the top or cover G should be securely connected With the bottom D, so as to prevent any leakage at the edges of the inner Wall A. A rubber gasket G2 may be applied to the cover, so as to engage the flange A; In order to rovide a receptacle for the Water expelled y the inflation of the bag F Without unduly increasing the height of the tank E, the latter may be made with a standipe E extending upward ly beyond the cover It Will' be obvious that in the operation above described anv opening K Will be produced at the bottom of the filter-lining K. (See Fig. 4.) In cases Where it is desired to -produce a iilter having a closed bottom the gpc 12 Would terminate above the bottom 2 of the receptacleand Within the bag F', Fig. 5. In this case the cover G3 could be lifted with the pipe I2 and bag F after the production of the iilter, and then the bottom of the lining vWould be closed entirely by the end portion. As in this case the pipe I2 does not extend through the bottom D2, other means than those used in Figs. 1, 2, and

, 3 must be provided for holding the cover G hinged tothe bottom down. For instance, screw-rods L may be D2 and iitted into slotvted ears G4 of the cover, the tension being produced by means of Winged nuts M.

'In Figs. 6 and 7 the inner Wall a is formed vby rolling a sheet of Wire-gauze or the like into cylindrical form, so that there will be two or more layers at certain points, and this cylinder is thenheld in shape in any vsuitable manner, by end rings a', L-shaped in cross- .section and adapted "to engage gaskets d g2,

located on the bottom d and cover g, respectively. The bottom d is shown integral with a c lindrical imperforate outer Wall c. This Walmay be provided with a stand-pipe e corres ending in function to the stand-pipe E". plug g" normally closes an opening in the cover g, through which the chamber j may be iilled with pulp suspended in Water. This chamber also containsv 'the expansible body ,iitted on the pipe (i, through which air or ot er suitable medium may be blown or forced into'the bag f to expand the same. Nuts h fi hold the parts of the apparatus together. The operation is exactly the same as With the form of construction first described, With the additional advantage that the pulp lining may be strip ed much more readily from the perforatedpwall upon which it is formed, so that such lining may be taken off and applied to other carriers. The cleaning of the perforated Wall is also much facilitated by this construction. l

While I have described the production of a compressed-pulp' lining forming a filter on the inner surface of the inner Wall, I desire it to be understood that my invention is not restricted to the particular construction illustrated.

In all the forms of apparatus herein shown it obviously is easy to substitute perforated Walls A a of different diameters for those shown in the drawings, so that the same a paratus may be used for making filters of different sizes.

Instead of pulp I may-'employ any other substance capable of suspension in Water or other liquid and of separation from said liquid by forcing the liquid throughl a perforated Wall. If such substance is porous, the re- TOO sulting sheet or lining can be used for filtering purposes. In all events a lining will be produced which conforms to the shape of the Wall, so that my invention, considered broadly, provides means 'for molding articles of various kinds quickly and Without requiring the application of heat.' y

Various modiiications may be made Without departing from the nature of my invenrr 5, i

tion.

I claim as my invention- A filter consisting of a cylindrical relativelyV rigid Wall having perforations, and a cylindrical lining of com ressed pulp applied to said Wall and provi ed with apulp bottom integral With the pulp-cylinder.

In testimony Whereof'I- have hereunto set IIO my hand in the presence of tWo subscribing witnesses.A

GEORGE -M. KNEUPER.

Witnesses JOHN LoTKA,"1v EUGENE EBLE. 

